Students learn that customary units can be converted to metric units and metric units can be converted to customary units using the following conversion factors: 1 mile = 1.6 kilometers, 1 liter = 2.1 pints, 1 inch = 2.54 centimeters, and so on. Students are then asked to solve problems using these conversion factors, such as 10 kilometers = ____ miles. Students are also asked to determine which customary unit of measurement and which metric unit of measurement are used to measure a given object. For example, milk in a bottle would be measured in gallons (customary) or in liters (metric).